Am I Ridgeback/Boxer mix or Ridgeback/Pitbull mix?

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I adopted this dog at almost 4 months and all I was told of her breed info is that they BELIEVE she is part hound, but this has not been affirmed. After researching dogs, I have started to believe she is either part Ridgeback part Boxer, or part Ridgeback part Pitbull.

Here is a picture of her mommy who is a "hound mix", but we really don't know what she is either. This is why I suspect Pitbull in my puppy. The mom looks like a Pitbull mix to me, not really sure though.

http://img.photobucket.com/albums/v311/MyPirateLovesYou/E mmy.jpg

Here is a picture of a Ridgeback/Boxer
http://img.photobucket.com/albums/v311/MyPirateLove sYou/Medium.jpg

And another one
http://img.photobucket.com/albums/v311/MyPirateLovesYou/4247134 580_f470ba65c8.jpg

And a Ridgeback/Pitbull mix
http://img.photobucket.com/albums/v311/MyPirateLovesYou/93e43a1 b-b167-4c66-95c1-638401f29a63.jpg

I would really appreciate your opinions, as I do not know much about the breed.